What would be the most appropriate response to the following scenario?

You ordered 50,000 sacks of rice, but only received 30,000 sacks.

a) Contact the supplier to inquire about the missing sacks and request a refund or delivery of the remaining sacks.
b) Accept the 30,000 sacks and make do with the received quantity.
c) Do nothing and assume it was a mistake.
d) Cancel the order and find a new supplier.